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I have an Iphone 3G with ios 4.2.1. I am using internet on my phone using Cellular data turned ON. It works fine for some time, but after then it disconnects and does not work untill i restart my phone. What is the issue.

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Was your problems solved? I'd be helpful to improve this site by providing feedback no matter if an answer worked or not. – gentmatt Dec 20 '11 at 20:18

Some phones do not re-login to the celluar network once disconnected. That's why a restart helps.

However, try "Reset Network Settings" on the iphone.

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